Obviously having two systems is an issue but additional question that comes to my mind is how initial decision is made which OCS should control particular user? Is it a simple number series rule (when new batch of SIM cards is rolled out OCS is selected) or is there some more complex scenario?
This is important as one possible option would be that once sharing is enabled all related users are moved/migrated to same OCS where relationship between end users and logic which pool to use for particular usage will be implemented. This would require not only migration between two OCS but also update of network trigger for migrated end users. Depending how it is done on network side this might require some additional work/changes.Best regards,Samir